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川中防护林林分类型不同，承受降雨过程产生的地表径流和土壤侵蚀产沙量也不同，钙质紫色土上其减水减沙贡献最大的是落叶灌木林，其次是桤柏混交林，主要是枯枝落叶层的作用，马尾松疏林土壤侵蚀量是马尾松柏木林的２．７倍。随着降雨量增大和雨强增强，冰碛黄土上松柏混交林减水减沙效益最大，是一种川中地区典型的水土保持林类型。针叶林的削减水沙的作用是有限的。松柏混交林产沙率变化与该林分下洪峰流量变化相一致。马尾松疏林产沙率过程线随流量增大变得陡峻，时间基本与地面产生细沟的时间相吻合
Different types of shelterbelts in central Sichuan have different types of surface runoff and soil erosion and sediment yield due to rainfall. Deciduous shrubs are the most important contributors to water and sediment reduction in calcareous purple soil, followed by mixed cypress and cypress forests, mainly The effect of litter layer was that Pinus massoniana forest soil erosion amount was 2.7 times that of Pinus massoniana forest. With the increase of rainfall and the increase of rainfall intensity, the benefits of water and sediment reduction are the largest in the mixed forests of pine and cypresses on moraine loess, which is a typical type of soil and water conservation forest in central Sichuan. The role of coniferous forests in reducing water and sediment is limited. The change of sediment yield of coniferous and cypress mixed forest is consistent with the change of flood peak flow below the stand. Masson pine forest sediment yield process line becomes steep with the flow rate increases, the basic time and the ground rills coincide with the time